So, I've been reloading .38 Special about two years or so. Some cases I have may have been shot as few as three times, to as many has a dozen times. Some cases were given to me used, so they may have been shot even more than that. I have a few of everything and don't segregate my brass.
I feel that over the last 6 months my groups have been opening up. I have been feeling that I have been getting worse, as a shooter, some days. That is, until a about a month ago.
At the range some boy left behind about 40 pieces of new PPU 38 Special.
I made a batch of one of my loads with just that new brass and wow, my groups tightened up nicely! Same load I've been shooting, but much smaller groups.
Could it be, is it possible, that my brass is work hardened and negatively affecting my accuracy? Would annealing improve the preformance of my boolits?